May I help you ?   Yes . I would like a ticket to Pakistan on CA .   Is that a one-way or round trip ?   Round trip , please .   When would you want to leave ?   I'd like to leave on Nov . 2nd and return on Nov . 21st .   I am sorry . The flight on Nov . 21st is full.Do you mind if I put your name on the waiting list ?   Yes , please . Thank you . 